Tom Lane, 26.03.2013 17:16:
The lack of any prohibition to the contrary means there is no way to argue that the code you showed previously violates the spec; thus, a database that fails to accept it is rejecting spec-compliant DDL.
I'm not claiming that the spec is violated... (And I'm not complaining either. I'm just curious if there was a technical reason)
Well, it's redundant, but that doesn't make it wrong. In any case, there are lots of ways that things might be redundant. Should we reject a unique constraint on (a,b) if there's already one on (b,a)? Or if there are separate unique constraints on each of a and b?
Hmm, good point. Although I think a definition that is identical with regards of the columns and their position in the constraint _could_ be considered identical. Anyway thanks for the feedback.
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